本文提供了一系列JavaScript函数，用于验证输入数据的有效性，包括但不限于空值检查、数字验证、指定范围内的数字、整数、正数、合法字符、长度限制以及电子邮件验证。同时介绍了字符串格式化、大小写转换、日期比较、特殊字符替换等功能。
1.// 是否为空，非空返回真，不非为空返回假
2.function isBlank(str) {
3. var blankFlag = true;
4. if (str.length == 0) return true;
5. for (var i = 0; i < str.length; i++) {
6. if ((str.charAt(i) != "") && (str.charAt(i) != " ")) {
7. blankFlag = false;
8. break;
9. }
10. }
11. return blankFlag;
12.}
13.function checkNotNull(theField, fieldName) {
14. if(isBlank(theField.value)){
15. alert(fieldName + "不可为空！");
16. if(theField.type!="hidden"){
17. theField.focus();
18. }
19. return false;
20. }
21. return true;
22.}
23.
24.// 是否为数字
25.function checkNumber(theField, fieldName) {
26. var pattern = /^([0-9]|(-[0-9]))[0-9]*((\.[0-9]+)|([0-9]*))$/;
27. if(theField.value.trim() == "") return true;
28. if (!pattern.test(theField.value.trim())) {
29. alert(fieldName + "必须为合法数字");
30. theField.focus();
31. theField.select();
32. return false;
33. }
34.
35. return true;
36.}
37.
38.function isNumber(str) {
39. var pattern = /^([0-9]|(-[0-9]))[0-9]*((\.[0-9]+)|([0-9]*))$/;
40. if(str.trim() == "") return false;
41. if (!pattern.test(str.trim())) return false;
42. return true;
43.}
44.
45.// 是否为指定范围数字
46.function checkNumberRange(theField, fieldName, min, max) {
47. if(theField.value.trim() == "") return true;
48. if (!checkNumber(theField, fieldName)) return false;
49.
50. if ((min != "") && (theField.value.trim() < min)) {
51. alert(fieldName + "不可小于" + min + "！");
52. theField.focus();
53. theField.select();
54. return false;
55. }
56.
57. if ((max != "") && (theField.value.trim() > max)) {
58. alert(fieldName + "不可超过" + max + "！");
59. theField.focus();
60. theField.select();
61. return false;
62. }
63.
64. return true;
65.}
66.
67.function isNumberRange(str, min, max) {
68.if(str == "") return false;
69. if (!isNumber(str)) return false;
70.
71. if ((min != "") && (str < min)) {
72. return false;
73. }
74.
75. if ((max != "") && (str > max)) {
76. return false;
77. }
78.
79. return true;
80.}
81.
82.// 是否为整数
83.function checkInteger(theField, fieldName) {
84. var pattern = /^(\d|(-\d))\d*$/;
85.
86. if(theField.value.trim() == "") return true;
87. if (!pattern.test(theField.value.trim())) {
88. alert(fieldName + "必须为整数！");
89. theField.focus();
90. theField.select();
91. return false;
92. }
93.
94. return true;
95.}
96.
97.function isInteger(str) {
98. var pattern = /^(\d|(-\d))\d*$/;
99.
100. if(str.trim() == "") return false;
101. if (!pattern.test(str.trim())) {
102. return false;
103. }
104. return true;
105.}
106.
107.// 是否为指定范围内整数
108.function checkIntegerRange(theField, fieldName, min, max) {
109. if(theField.value.trim() == "") return true;
110. if (!checkInteger(theField, fieldName)) return false;
111.
112. if ((min != "") && (theField.value.trim() < min)) {
113. alert(fieldName + "不可小于" + min + "！");
114. theField.focus();
115. theField.select();
116. return false;
117. }
118.
119. if ((max != "") && (theField.value.trim() > max)) {
120. alert(fieldName + "不可超过" + max + "！");
121. theField.focus();
122. theField.select();
123. return false;
124. }
125.
126. return true;
127.}
128.
129.function isIntegerRange(str, min, max) {
130. if(str == "") return false;
131. if (!isInteger(str)) return false;
132.
133. if ((min != "") && (str < min)) {
134. return false;
135. }
136.
137. if ((max != "") && (str > max)) {
138. return false;
139. }
140.
141. return true;
142.}
143.
144.// 是否为正数
145.function checkPositiveNumber(theField, fieldName) {
146. if(theField.value == "") return true;
147. if (theField.value.charAt(0) == '-') {
148. alert(fieldName + "必须为正数！");
149. theField.focus();
150. return false;
151. }
152.
153. return true;
154.}
1.// 是否规定的浮点数，包括小数点前的位数和小数点后的位数，beforeDec是小数点前的位数，afterDec是小数点后的为数
2.function checkDecimalNumber(theField, fieldName, beforeDec, afterDec){
3. if (theField.value == "") return true;
4. var pattern ="/^(|[+-]?(0|([1-9]\\d{0,"+(beforeDec-1)+"})|((0|([1-9]\\d{0,"+(beforeDec-1)+"}))?\\.\\d{1,"+afterDec+"})){1,1})$/";
5. if (!eval(pattern).test(theField.value)) {
6. alert(fieldName + "必须为合法数字,允许小数点前"+beforeDec+"位和小数点后"+afterDec+"位之内");
7. theField.focus();
8. theField.select();
9. return false;
10. }
11. return true;
12.}
13.
14.//使用 prototype 为 String 对象增加一个新方法 length2，找出字符串中有多少个汉字，然后将这个数字加上 length 的值就是我们想要的结果了。
15.String.prototype.length2 = function() {
16. var cArr = this.match(/[^\x00-\xff]/ig);
17. return this.length + (cArr == null ? 0 : cArr.length);
18.}
19.// 限制字串最大长度
20.function checkLength(theField, fieldName, maxLength) {
21. if(theField.value == "") return true;
22. if (theField.value.length2() > maxLength) {
23. alert(fieldName + "的字数最多为" + maxLength + "字！");
24. theField.select();
25. theField.focus();
26. return false;
27. }
28.
29. return true;
30.}
31.
32.// 限制字串长度,注意参数顺序
33.function checkLength2(theField, fieldName, maxLength, minLength) {
34. if(theField.value == "") return true;
35. if (theField.value.length2() > maxLength) {
36. alert(fieldName + "的字数最多为" + maxLength + "字！");
37. theField.focus();
38. return false;
39. }
40.
41. if ((minLength != "") && (theField.value.length2() < minLength)) {
42. alert(fieldName + "的字数最少为" + minLength + "字！");
43. theField.focus();
44. return false;
45. }
46.
47. return true;
48.}
49.
50.// 所输入字符串是否均为合法字符
51.// charBag中为包含所有合法字符的字符串
52.function checkStrLegal(theField, fieldName, charBag) {
53. if(theField.value == "") return true;
54. for (var i = 0; i < theField.value.length; i++) {
55. var c = theField.value.charAt(i);
56. if (charBag.indexOf(c) == -1) {
57. alert(fieldName + "含有非法字符(" + c + ")！");
58. theField.focus();
59. return false;
60. }
61. }
62.
63. return true;
64.}
65.
66.// 所输入字符串是否均为合法字符
67.// charBag中为包含非法字符的字符串
68.function checkStrLegal2(theField, fieldName, charBag) {
69. if(theField.value == "") return true;
70. for (var i = 0; i < theField.value.length; i++) {
71. var c = theField.value.charAt(i);
72. if (charBag.indexOf(c) > -1) {
73. alert(fieldName + "含有非法字符(" + c +")！");
74. theField.focus();
75. return false;
76. }
77. }
78.
79. return true;
80.}
1.// 电子邮件验证
2.function checkEmail(theField) {
3. var pattern = /^.+@.+\..+$/;
4.
5. if(theField.value == "") return true;
6. if (!pattern.test(theField.value)) {
7. alert("请输入合法的电子邮件地址");
8. theField.focus();
9. theField.select();
10. return false;
11. }
12.
13. return true;
14.}
15.
16.// 是否为只读域（如file，text等域只接受右边按钮选择传回的结果）
17.function checkReadField() {
18. alert("请点击后面的图标进行选择");
19. // this.blur();
20.}
21./*
22.* RoundTo(Digit,How):数值格式化函数，Digit要格式化的数字，How要保留的小数位数。
23.*/
24.function RoundTo(Digit,How)
25.{
26. Digit = Math.round(Digit*Math.pow(10,How))/Math.pow(10,How);
27. return Digit;
28.}
29.//去除字符串的前后空格
30.String.prototype.trim = function()
31.{
32. return this.replace(/(^\s+)|\s+$/g,"");
33.}
34.
35.//将指定的字段转换为大写
36.function UpperCase(theField){
37. theField.value = theField.value.toUpperCase();
38.}
39.
40.//将指定的字段转换为小写
41.function LowerCase(theField){
42. theField.value = theField.value.toLowerCase();
43.}
44.
45.//比较两个时间大小，相等或第二个大返回true,第一个大返回false.
46.//现在只支持2005-12-30或2005-12-30 10:00:00的时间格式
47.function DateCompare(theField1,fieldName1,theField2,fieldName2)
48.{
49. var d1 = theField1.value;
50. var d2 = theField2.value;
51. if (d1==d2) return true; // 相等
52. var a1 = null;var a2 = null;
53. var b1 = null;var b2 = null;
54. if (d1.length==10){
55. d1 += " 00:00:00";
56. }
57. a1=d1.substring(0,10).split("-");
58. a2=d1.substring(11).split(":");
59. if (d2.length==10){
60. d2 += " 00:00:00";
61. }
62. b1=d2.substring(0,10).split("-");
63. b2=d2.substring(11).split(":");
64.
65. for (i=0;i<3;i++){
66. if( a1[i].charAt(0) == '0' ) { a1[i] = a1[i].substring(1,2); }
67. if( b1[i].charAt(0) == '0' ) { b1[i] = b1[i].substring(1,2); }
68. if (parseInt(a1[i])>parseInt(b1[i])){
69. alert(fieldName1+"不能大于"+fieldName2);
70. return false;
71. }
72. if (parseInt(a1[i])<parseInt(b1[i])){
73. return true;
74. }
75. }
76. for (i=0;i<3;i++){
77. if( a2[i].charAt(0) == '0' ) { a2[i] = a2[i].substring(1,2); }
78. if( b2[i].charAt(0) == '0' ) { b2[i] = b2[i].substring(1,2); }
79. if (parseInt(a2[i])>parseInt(b2[i])){
80. alert(fieldName1+"不能大于"+fieldName2);
81. return false;
82. }
83. if (parseInt(a2[i])<parseInt(b2[i])){
84. return true;
85. }
86. }
87.}
88.
89.//将给定的字符串中的&字符替换成@@
90.function ConvertStr(s){
91. var i;
92. var s2 = s;
93.
94. while(s2.indexOf("&")>0){
95. i = s2.indexOf("&");
96. s2 = s2.substring(0, i) + "@@" + s2.substring(i + 1, s2.length);
97. }
98. return s2;
99.}
100.
101.//将给定的字符串中的@@字符替换成&
102.function ReConvertStr(s){
103. var i;
104. var s2 = s;
105.
106. while(s2.indexOf("@@")>0){
107. i = s2.indexOf("@@");
108. s2 = s2.substring(0, i) + "&" + s2.substring(i + 2, s2.length);
109. }
110. return s2;
111.}
112.//将给定的字符串中的单双引号转义
113.function ForamtValue(oStr)
114.{
115. switch(typeof(oStr))
116. {
117. case "date" :
118. //直接toString()转换,可以加入丰富的显示方式
119. sStr = (new Date(oStr)).toString();
120. break;
121. default :
122. sStr = String(oStr);
123. }
124. sStr = sStr.replace(/\"/g,"""); //输入框中显示双引号问题
125. sStr = sStr.replace(/\'/g,"'"); //输入框中显示单引号问题
126. return sStr;
127.}
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